How to make 3 pins power ( V+ GND V- ) from 12v Battery ?

Discussion in 'General Electronics Chat' started by Tùng Sơn Lê, Jun 21, 2017.

  1. Tùng Sơn Lê

    Thread Starter New Member

    Jun 21, 2017
    2
    0
    Hello everyone,
    I am doing a DIY speaker which i want to have a micro , a guitar input with a bluetooth amplifier ( TDA7492 Bluetooth ) . Everything was ok until i met the problem about power for opamp to gain for micro & guitar , it requires V+ GND V- , and i just have the 12v battery for TDA 7492 .

    So how can i make 3 pins power ( V+ GND V- ) from 12v Baterry ?

    Thank you very much ,
    Tungggg
     
  2. EM Fields

    Active Member

    Jun 8, 2016
    583
    154
    Use an isolated DC to DC converter to generate the negative voltage and tie its positive voltage to battery minus/ground.
     
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  3. JUNELER

    Member

    Jul 13, 2015
    181
    25
    Hi,
    Im trying to find an IC for your needs but i cant find. Another solution is to create a circuit using a transformer.
    Primary side is input like 110vac or 220vac as you like. On the secondary side a 12vac o 12 vac wiring.Center tap secondary.
    Rectify a positive 12v and a rectify negative 12v if you know how to do it . Or else you can buy a ready made available power supply with an
    output of your needs.
     
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  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Since the -ve supply is used only for the opamp, instead of a true GND you can use a virtual ground .
    The 0V and +V rails are then treated as -V and +V respectively, avoiding the need to generate a true negative supply. The opamp's signal input and output would each require an AC coupling capacitor.
     
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  6. Tùng Sơn Lê

    Thread Starter New Member

    Jun 21, 2017
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  7. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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